Good evening Kieran and welcome to the Events Calendar Support forum!
Thank you for reaching out to us.
We are sorry to hear about the notifications emails not being received by 2 out of 3 of your recipients.
I would love to help you with this topic.
The only odd thing about the emails is that they stretch over two lines as they are long email addressed.
That’s OK, as long as you make sure you hit the “enter” key after each to start a new line (which separates email addresses).
Using other separators (such as “;” or “,”) will not work.
It is also possible that the other 2 recipients could be blocking the email. The reason for that is because, by default, the notifications are being sent by WPmail ([email protected]).
You could probably test that out by configuring, testing and using a plugin such asĀ https://wordpress.org/plugins/easy-wp-smtp/
Let me know how that goes.
Best regards,
Geoff B.